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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > E90 335XI Front Ball Joint Tool DIY



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      09-01-2019, 11:54 AM   #1
Foghorn
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Drives: 2007 335XI
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E90 335XI Front Ball Joint Tool DIY

I recently changed my front ball joints on a 2007 E90 335XI for which I made a tool that may come in handy for some of you.


I had read a couple of threads here;


https://www.e90post.com/forums/showthread.php?t=1498039


https://www.e90post.com/forums/showthread.php?t=1156333


A couple of notes to start.


I cleaned around the ball joints with an angled pick to remove any rust build up before using a mix of 50/50 acetone and tranmission fluid (Mercon or Dexron) a couple of days before the job and again the day before.


Picture courtesy of JDoms47



The tool is made from a piece of 2" pipe thread (2.375" OD) by 2 1/2" long. I used a vice to squash the pipe and hack saw to make the cutouts from the ball joint mounting franges. I used a piece of steel plate on the top, which I had a friend weld, with a 9/16" through hole that also drilled with a 3/4" bit from underneath to allow enough travel to pull the ball joint 1/4" out of the spindle, at that point the ball joint is easy to remove with a few taps.


Once the tool was tightened onto the ball joing with a 1/2" drive ratchet (use a washer and grease between the tool and the ball joint nut), I then used a piece of 1" shaft and 4 Lb hammer to hit from above.


Two things here: I don't know if I could have used a power bar with the tool alone to pull the ball joint out. Secondly, the shaft I used was long which limited the space to strike with a hammer.


I hit the ball joint 3 times being carefull to line up the 1" shaft to hit aroung the perimeter of the ball joint. I then checked the tension on the tool and was able to tighten it further, took a few more hits from the top, tightened the tool again. I repeated this a few times and the ball joints came out without too much fuss.


I should mention this car has 170K Kms on it, has always been winter driven and a lot of salt is used on the roads.


Here's a few pictures of the tool, hope this may help someone out:
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